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Prospective changes to condylar position in symphyseal distraction osteogenesis.
Constantin A Landes1, Katharina Laudemann, Robert Sader
1Department of Oral Maxillofacial and Plastic-Facial Surgery, Frankfurt University Medical Center, Frankfurt, Germany. c.landes@lycos.com
Summary
Mandibular symphyseal distraction osteogenesis (MSDO) effectively corrects dental crowding without causing lateral condylar displacement. This procedure does not negatively impact temporomandibular joint function, according to short-term outcomes.
Area of Science:
- Orthodontics and Maxillofacial Surgery
- Temporomandibular Joint (TMJ) Research
Background:
- Mandibular transverse deficiencies and dental crowding often require surgical correction.
- Symphyseal distraction osteogenesis is a technique used to address these issues.
- Potential effects on temporomandibular joint (TMJ) function are a concern.
Purpose of the Study:
- To determine if symphyseal distraction for mandibular correction causes lateral condylar shift.
- To assess the secondary influence of this shift on TMJ function.
Main Methods:
- Nine patients undergoing mandibular symphyseal distraction osteogenesis (MSDO) were studied.
- Pre- and postoperative CT scans evaluated intercanine distance and condylar position.
- Distraction was applied at 0.6 mm/day, starting 5 days post-surgery.
Main Results:
- Intercanine distance significantly increased by 3.8 mm (P=.004).
- Condylar distance decreased by 1.2 mm (P=.02).
- No significant changes in condylar angulation or distances to the fossa were observed.
Conclusions:
- MSDO does not cause lateral condylar displacement; it reduces transversal condylar distance.
- The procedure appears to maintain TMJ stability, with no significant impact on function.
- Long-term outcomes and soft tissue changes warrant further investigation.
